I was required by a client to use his own Pro connect tax software. He needs to file an individual tax return, a partnership, a s-Corp and a c-corp. I will be paid on hourly rate. He said he will need to file extension, meaning the tax return will be e-filed just before Oct. 15th, 2024.  The client has around 100 real estate properties. Now he wants to sign contract with me. I have no experience on handling this kind of client. ( I usually use the pro connect tax online I purchased and deliver the return after the payment.). What should I mention on the contract? Please feel free to give your opinions and advises. Your help will be really appreciated.